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When the W-LEVEL is set on YES and you have a discontinuty in your WALL table you can't use the IDENTifiers. You have to use AX-L, AX-LP, NODE or ELEM for the toggling state. This is not user-friendly when your configuration changes in the POLYDIF.

There is space in the DEADW input table for a DEADW-3 and DEADW-4 column:
DEADW-1 - deadweight pipeline part under water level left of the node (identifier);
DEADW-2 - deadweight pipeline part above water level left of the node (identifier);
DEADW-3 - deadweight pipeline part under water level right of the node (identifier);
DEADW-4 - deadweight pipeline part above water level right of the node (identifier);
W-LEVEL = YES

If W-LEVEL is empty or set on NO then DEADW-3 and DEADW4 should be empty:
DEADW-1 - deadweight pipeline part under or above water level left of the node (identifier);
DEADW-2 - deadweight pipeline part under or above water level right of the node (identifier);
W-LEVEL = NO or empty

You are correct, currently you can either use DEADW1 and DEADW2 to define a jump in deadweight, or use DEADW1 and DEADW1 to define the situation above and below water, but not both situations together.
We filed this request as ticket no. 1128.

Another way is to allow duplicate IDENTIFIER names near each other to simulate the jump. The error shouldn't be displayed. The error should only be displayed when the IDENTIFIERS are not in increasing order.

This is then also backwards compatible with the older version of Ple4Win. The dimensions of the DEADW table would be the same.